| ??? 09/09/05 23:50 Read: times |
#100886 - A common 'gotcha' Responding to: ???'s previous message |
One thing I got caught with many years ago was with our good friend the common lcd using the HD44780 style chip. Being the smart engineer, I read the status bit and waited until it finished. Then I had displays that failed and my poor code would lock up and the watchdog would reboot the system. It took me a while to figure out that the lcd was dead. I still see the same trap repeated add-infinitum. Nowadays I just use a delay rathe than explicitly wait for the device to finish. Actually, the classier solution would be to read the status bit and put a timeout around it as Erik suggests - but then the problem is how to cope with the error in case the lcd does fail. |
| Topic | Author | Date |
| I just had to fix something in a system | 01/01/70 00:00 | |
| 90:10 Rule | 01/01/70 00:00 | |
| code like this is where we hear "the cod | 01/01/70 00:00 | |
| Testing | 01/01/70 00:00 | |
| A common 'gotcha' | 01/01/70 00:00 | |
| Design document | 01/01/70 00:00 | |
| What is magic document you speak of? | 01/01/70 00:00 | |
Ask | 01/01/70 00:00 | |
| Normal | 01/01/70 00:00 |